High-energy gamma-ray astronomy

Details High-energy gamma-ray astronomy High-energy gamma-ray astronomy

Sep 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pht....28i..42f&link_type=abstract

Physics Today, vol. 28, Sept. 1975, p. 42-47, 50.

Astronomy and Astrophysics

Astronomy

Energy Spectra, Galactic Structure, Gamma Rays, Radiation Detectors, X Ray Astronomy, Cerenkov Radiation, Cosmology, Diffuse Radiation, Galactic Radiation, Radiant Flux Density, Spiral Galaxies

Scientific paper

The subject of gamma-ray astronomy is discussed with emphasis on celestial gamma rays with energies in excess of 10 MeV. Early observations of such gamma rays are reviewed, a gamma-ray spark-chamber telescope is described together with a gas Cerenkov-counter telescope, and the gamma-ray sky is delineated. It is shown that the diffuse high-energy gamma radiation from the galactic plane probably results primarily from cosmic-ray interactions with interstellar matter. Mechanisms for gamma-ray production are identified, and it is noted that the general galactic radiation may prove to be of great value in studies of galactic structure. Possible sources are considered for the diffuse celestial radiation, and discrete sources are described, including the Crab pulsar, the Vela remnant, the Cygnus region, and Gould's Belt. Future developments in gamma-ray astronomy are considered.

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